How many amps do our alternators put out ?

how much avg current do the vital systems draw ?!

say, 2 low beams, fuel pump, coil, PCM, gauges, waterpump and fans (could probably turn fans off) .. and 2 NX solenoids perhaps !!!

thinking about yanking the battery before running down the track .. im sure i wont need fans going that fast ! but i wonder if the alternator can produce enough current to supply the vital systems during a 1/4 mile run ...

thats 30# of weight off the front end for free

 

Alternators put out 135 amps. As far as running without a battery these cars do some wierd stuff with a low or dead battery, I haven't tried running without one, Maybe someone else has some expierience with that

 

see .. if ur battery is low or dead .. it puts a LOT of draw on the alterator to charge it self !!! but if u got no battery !! there is no draw !!

in my daily driver (89 cutlass calais) everytime i wear the battery down and start up the car . the alt belt squeels like a pig till the battery charges up a bit , although its on tight .. and the more electrical draw on the alt, the harder it is to spin it (same reason some people pull their serpentine belts .. but thats a diff story)

now if injuneer, shoebox, or any other intelligent being here could go over the draw on each of the following that would be helpfull

low beams / tail lights
fuel pump (walbro 255 lph)
coil / ignition box (i guess this is RPM dependent?!)
external gauges / dashboard etc
waterpump (meziere)
fans (will turn them off past 20 mph if i pull the battery)
PCM / injector drivers (injectors are rpm dependent again!?)
NX solenoids

 

yea, I would reccomend against it. you will put a lot of drag on the alt. prolly hurt you more than the weight saved.

 

hmm i can try pulling the battery cable on the dyno .. to see if the extra drag on the alt would even translate to any RWHP loss !!

if not .. and if the alternator output is enough to feed every vital system in the car ...

why not !?

last time i tried to take 30# off the car it cost me $400 in a K member !! this ones free ..

heres some more 'info' i got on my local forum

The police-issue 140 Amp alternator (for most 4th gens as well, although some 93/94 models got the smaller 110 amp version. ) should be plenty for most. At 13.8 volts thats a bit over ~1900 watts. With a 10% overdrive pulley (i.e. the Impalla SS pulley works) you "could" milk the stock stuff for 2100 watts when running.

 

do what i did! relocate the battery to the rear spare tire well.. then run no belt at the track! i broke an alternator and a power steering pump on TWO seprate occasions because of running a belt! so i figure i gotta take it off or im liable to break something and this way im saving HP at the same time

 

hmm i dunno about that ... im trying to LOSE weight .. not add !! all that 0 gauge wire must weight at least 10-15 lbs !!

ever think that ur alt or belt broke because of extra load on the alt due to extra resistence in the battery cable !? maybe its not proper gauge !? maybe its too long ?!

and im not going to take off my belt going down the track ! last thing i want is for my fuel pump to get shafted out of electicity while in on the bottle at 7000 rpm .. thats why im trying to make sure the pump will get all the power it needs if i do the !battery mod

 

That's a good way to toast your alternator. See the problem is, you start car, disconnect battery, alternator see's 0 volts because you have removed your battery, so alternator says hmmm, zero volts, battery must be dead, I'll go wide open to recharge battery. So while your sitting in the staging lanes, doing your burnout, making your pass, your alternator is trying to charge a battery that ins't there going wide open the whole time, very hard on alternator. JMO.

 

alternator goes wide open !?

i had no idea the alternator has a throttle like mechanism to make itself to wide open .. or not as open !!! ?!

a dead batter and a non existing battery are totally different in the eyes of the alternator for what i know !

a dead battery is a huge draw on the system as a whole ! so the alternator has more draw on it to fill the gap, therefore it becomes harder to turn by the serpentine belt.. a non existent batter is .. well .. no existent !! therefore it cant cause any draw on the system ..

and im not sure if the alternator will see 0 volts if the battery is out as its supplying 13.8 on its own ... and the system as a whole still has 13.8 volts of power ... the battery is merely a storage for electric power to be used when the alt isnt turning !!

 

uhhh NO dude thats the dumbest thing ive ever heard im sure your car is very weight balanced with that battery under the hood instead of over the REAR TIRES where you could use the weight!

try running a 10.56 at 4800ft ABOVE SEA LEVEL and then youll undertand why an alternator cant handle that kinda launch

 

so ur telling me that ur alternator broke due to ur 60' G force ?! and taking off the belt saves the alternator from breaking !?? i dont get it ?!

what does ur ET have to do with ur alternator breaking !? and how does taking off the belt save it from breaking !?

i dont care for relocating my battery man ... than ! i just wanna do weight reduction the cheap way

that battery weights 30lbs .. it'll do me more good sitting in the pits than sitting on top of my wheels .. my full nitrous bottle weights 30# !! and its sittin right where the battery would if i were to relocate it !!!

when i become THAT desparate for traction i'll put sandbags in my trunk

 

becuase if the belt isnt hooked up then there can be NO DRAG on the alternator causing it to sieze up!

like i said when you pull a 10 and start getting 1.4 60' times THEN MAYBE you will undertand these lil things!

 

Dude, how much do YOU weigh?
If you reached the point of madness where you're ready to sacrifice your engine by possibly running the fuel pump out of juice, might as well just not eat for a month and lose 30# off your own ***.

 

sorry man .. i've seen people in the 9s pulling 1.3 60s without their alternators siezing up !!!

did Taner pull his alternator belt to run his 9.4 run ?

so ur telling me that the launch G force causes extra drag on the belt which in effect siezes ur alternator and power steering pump and breaks them !??!?

either way .. we're getting off topic here ..

back to the subject please !

 

dude thats too much work
i weight 170 .. if i lost 30# id turn 2 dimensional and my arm would break power shifting

im trying to do my homework to make sure i dont sacrifice juice to my fuel pump before i do this !

hell i've seen stupider threads than this !! this ones actually worth something if it works !!!